Sony-ST5066-tun-sm 维修电路原理图.pdf
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1、USA, Canada, AEPand UK WodelJSPECI F ICATIONSJFM TUNER SECTIONTuning range:Antenna:Usable sensitivity:S/N ratio:Frequency response:Harmonic distortion:87.5 MHz to 108 MHz300 ohms balanced75 ohms unbalanced2.2pV (lHF)1.7 pV (S/N = 30 dB)68 dB30Hztol5kHz1jOaMono : O.5o/o at 400 Hz 75 kHzdeviation (100
2、%) Mod.Stereo : O.Bo/o at 400 Hz 7 5 kHzdeviation ( l0Oo/o) Mod.Greater than 35 dB at 400 HzFm stereo separation:A-M TUNER SECTIONTuning range: 530 kHz to l,6Ob kHzAntenna: Built-in bar antenna with externalantenna provisionSONfiFtYl STEREO /Ftr.AtvI TllNTNSensitivity:S/N ratio:Harmonic distortion:G
3、ENE RA LPower requ irements:Power consu mption:Dimensions:Net weight:48 dB/m, built-in antenna1 00 pV, externa I antenna50 dB at 50 mV/mo.6%120 volts, 60 Hz ac(USA and Canada Model)1 10, 127, 22O, 24O volts, 50/60 Hz ac(AEP and UK Model)23 watts41O (w) x 12O (hl x 284 (d) mmt6r/a (w) x qrr/ro (rr) x
4、 1 13Ao ldl inches4.8 ks (10|b 9 oz)SERtIOE MANUALRadioFans.CN 收音机爱 好者资料库Section1.TABLE OF CONTENTSTitleTECHNICAL DESCRIPTIONDIAGRAMS5-1. Mounting Diagram5-2. Schematic Diagram6. EXPLODED VIEWS7. ELECTRICAL PARTS LISTPagelll315t720l-l. Specificationsl-2. Block Diagram2. DISASSEMBLY AND REPLACEMENT2-
5、l . Front Panel Removal2-5. Printed Circuit Board Removal2-6. Switch ReplacementALIGNMENT AND ADJUSTMENT3-1. Fm I-f and Discriminator Alignment .:. . 63-2. Fm Frequency Coverage and Tracking Alignment . 73-3. Fm Stereo Separation Adjustment 834. A-m I-f Strip Alignment . . 93-5. A-m Frequency Covera
6、ge and Tracking Alignment 94. REPACKING3334553.5./VL/RadioFans.CN 收音机爱 好者资料库,Intermediate fre-quency: I O.7 MlzUsable sensitivity: 2.2 pY (IHF)1.1. SPECIFICATIONSFm Tuner SectionTuning range:Antenna:S/N ratio:Capture ratio:Selectivity:Image rejection:I-f rejection:Spurious rejection:A-m suppression:
7、Frequencyresp onse:Harmonicdistortion:Fm stereoseparation:19kHz, 38 kHzsuppression:A-m Tuner SectionTuning range:Antenna:87 .5 to 108 MHz300 ohms balanced75 ohms unbalancedt.7 1tY ( S/N = 30 dB)68 dB1.5 dB55 dB45 dB9s dB75 dB4s dB30Hz to 15 kHz t l OgMono: 0.5 % at 400 Hz 7 5 kHzdeviation (lOO Vo) M
8、od.Stereo: 0.8% at 400 Hz 7 5 kHzdeviation (lO0Vo) Mod.Greater than 3 5 dB at 400 Hz40 dB530 to 1,605 kHzBuilt-in ferrite bar antenna withexternal antenna provisionSECTION 1TECHNICAL DESCRIPTIONSensitivity:S/N ratio:Image rejection:I-f rejection:Harmonicdistortion:GeneralSignal outputsand impedance:
9、Circuit system:Semiconductors:Power require-ments:tyIntermediate fre-quency: 455 kHz (USA, Canada and AEpModel)468kHz (Uf Model)48 dBlm, built-in antenna100 ltV, external antenna50 dB at 50 mV/m45 dB at I p00 kIIz40 dB at 1,000 kHz0.6%NORMAL 0.7 5Y,4.5 kOHIGH 1.5 V, 3.3 kOat 400 Hz, 100 % Mod.FM ste
10、reo, FM/AM superhete-rodyne, switching MPX2 FETs, 20 transistors and 14diodes120 volts, 60 Hz ac (USA andCanada Model)1 10, 127 , 220, 240 volts, 50/60Hz ac (AEP and UK Model)Power consump-tion:Dimensions:Net weight:Shipping weight:23 watts4t0 (w) x 120 (h) x 284 (d) mm16r/d(w) x4tr/ro(h) x ll3/rcG)
11、inches4.8 kg (l0lb 9 oz)6.8kg (l5lb)rIttihItiFTttrIlFtI1-2. BLOCK DIAGRAM()r-d-sir=l.r r ()=OO.=or-f,-l-5rttttaruiosqF*qlraoAvU)alJJsl-f,qtt! !1-Nro8jtJJ k)88jl.|J .E8to.ts5aQroaatlJJl.l.lr-.tu-oqotol-oBta,.t:1*.Pt(OqPoCI99t-L nr4arJv, w,.I2Note: All screws in thisPhillips type (crossotherwisc indic
12、ated.SECTION 2DISASSEMBLY AND REPLACEMENTservicc manual arerecess type) unlessAMFMlampFig. 2-3. Dial lamp replacement2.1 . FRONT PANEL REMOVALl. Remove the two screws at both sides of the wood-en case. This frees the wooden case.2. Remove the TUNING knob by pulling it straightoff .3. Remove the two
13、screws from the bottom plateand one screw at both sides of the front subchassisas shown in Fig. 2-l and 2-2. This frees the frontpane1.Fig. 2-1. Front panel removal(bottom view),+.:iFig. 2-2. Front panel removal (side view)2.2. LAMP REMOVALDial Lamp1. Remove the screw shown in Fig. 2-3.This frees th
14、e dial lamp holder.2. Remove the lamp from the holder.Meter Lamp1. Straighten the flat spring, then pull it up as shownin Fig. 2-4. This frees the meter lamp holder.2. Remove the lamp from the holder.F ig. 2-4. Meter lamp removal2-3. DIAL CORD STRINGINGPreparationl. Cut a 1250 mm (5l-inch)inch) diam
15、eter dial cord.2. Tie the end of the cordFie. 2-5.length of 0.5 mm (l 164-to a spring as shown in3. Rotate the tuning drum fully clockwise (max-imum capacitance position).4. Hook the spring to the tuning drum as shown in.Fie. 2-5.Procedure1. Referring to Fig. 2-5 , proceed the stringing in nu-merica
16、l order as shown.Note: Refer to the ltig. 2-6, for wrapping thccord around the druttr.At the finish point of stringing. tiglrtenthe cord so that the spring is undcr tcn-sion, and squeeze the eYelet.2. After completing the dial cord stringing, makesure that the tuning system works properly.3dia I lam
17、pflat springmeterlamp holdermeter lampshade3.4.Apply a drop of contact cement to the finishpoint.2.4. FRONT SUBCHASSIS REMOVALPreparationFix the dial cord to the drum and the five pulleysby using a cellophane tape.Remove the tuning drum by removing the setscrew.3. Remove the front panel as described
18、 in Procedure2-r.Procedure1. Remove the two screws from the front bottom ofthe chassis as shown in Fig. 2-8.2. Remove the three screws at both sides of theihassis as shown in Fig. 2-9.3. Remove the two screws shown in Fig. 2-10. Thisfrees the front subchassis with dial cordF ig. 2-8.F ro nt su bchas
19、sl.s rem ova I(Bottom view)Put the dial pointer onFig. 2-7 , and tune the setMove the dial pointer todial indication coincidescarrier frequency.the cord as shown into the local fm station.the position where thewith the local station1.2.finish point starting PointFig 2-6. Wrapping the dial cordF ig 2
20、-7. D ial pointer installation,.Qthree clockwiseturnstuning drumat fullyclockwise positiond+Finish pointApplya drop ofcontactcem ent-F ig. 2-5. Dial cord stringing4,ikli-Fig. 2-9. Front subcha,ss/s removal(Side view)F ig. 2- I 0. F ront su bchassls remova I2.5. PRINTED CIRCUIT BOARD REMOVALI . Remov
21、e the front subchassis as described in Pro-cedure 2-4.2. Remove the four screws shown in Fig. 2-l L Thisfrees the printed circuit board.Fig. 2-l l. Printed circuit board removal2.6. SWITCH REPLACEMENTPushbutton Switch (a-key)l. Remove the printed circuit board as described inProcedure 2-5.2. Remove
22、the switch bracket by removing the twoscrews (P2.6 x 4) shown in Fig. 2-12.3. Remove the screw (P 2.6 x 14) from the bottomas shown in Fig. 2-12.4. With a soldering iron having a solder sucking tip,clean the solder from each lug of the switch.5. Install a new one.- bracketP 2.6x l4Fig. 2-12. 4-key p
23、ushbutton switch replacementE,E-=5SECTION 3ALIGNMENT AND ADJUSTMENT3.1, FM I-F AND DISCRIMINATORALIGNMENTCAUTIONThe ceramic filters in the fm i-f circuit areselected according to their specified centerfrequencies and color coded as shownin Fig. 3- l and listed in Table 3- l . Checkthe color code of
24、the filters to identifythe same center frequency when replacingany of these filters.TABLE 3.1.FM I.F CERANIC FILTERSSignal Generator MethodTest Equipment Required1. Signal generator capable of generating a 10.7 MHza-m/fm signal.2. OscilloscopeVertical sensitivity3. Ac VTVM4. Aligpment toolsPreparati
25、on:100 mV/cm minimuml. Connect the input cable of the oscilloscope withalligator clips to R 227 and ground on the fm (a-m)front-end/i=f amp/MPX board, and solder a 0.02pFcapacitor across these clips as shown in Fig. 3-3.2. Connect the output cable of the generator acrossCVl02 on the fm (a-m) front-e
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